Text To Speech Development
Text to Speech Services That Sound Right Inside Your Product
A voice is not a switch you flip on. It is a speaker chosen on evidence, a pronunciation dictionary for your own product names, prosody shaped through SSML, and a decision about streaming or batch. We build synthesised speech that holds up on every sentence, not just the demo.
Triple Protection Guarantee
- US-Registered Entity
- Signed IP Assignment
- Senior Engineers Only
Triple Protection Guarantee:
- US-Registered Entity
- Signed IP Assignment
- Senior Engineers Only
Years In Business
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Engineers On Staff
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Avg. Engineer Exp.
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Where TTS Goes Wrong
Voice Selection
Auditioned
Senior Engineers
Vetted Only
Timezone Overlap
Live Hours
Pronunciation
Lexicon Fed
Delaware LLC
US Entity
Latency Budget
Streaming On
Audio QA Passes
Every Build
Voice Consent Filed
On Record
Cost Per Word
Projected
IP Assignment
Signed
Delivery Overlap
Fixed
Hours
Audio Files Owner
You
Trusted By Startups
What Our Text to Speech Services Actually Cover
Text to speech services earn their fee in the places a demo never reaches. The voice that carried three sample sentences reading four thousand product names. A lexicon so your brand, your drug names and your ticker symbols are said the way your customers say them. SSML that puts the pause in the right place. And a latency budget that decides whether audio streams as it is generated or renders ahead of time.
Stallyons is registered in Delaware as a US company, and our engineers work a time-zone window agreed before the project starts, with four-plus hours of daily overlap. You sign a US contract, run diligence on a US entity and pay one US invoice. Behind the work sits twelve-plus years of delivery across six continents and around thirty-five engineers, averaging four-plus years of production experience. Teams come to us when synthesised audio has to be shipped to real users rather than played once in a board meeting.
What A Voice Build Covers
A voice chosen against your own script, not a vendor sample reel: shortlisted candidates read your real copy, your team listens blind, and the winner is recorded as a decision with the reasons behind it.
A pronunciation lexicon for the words that matter to you: product names, place names, clinical terms, tickers and abbreviations, entered once and applied everywhere rather than fixed sentence by sentence.
SSML and prosody under your control: pauses, emphasis, rate, pitch and say-as rules written into the pipeline, so numbers, dates, currency and addresses are spoken the way a person would read them.
A latency decision made on evidence: streaming synthesis where the user is waiting, batch rendering where they are not, and a cache that stops you paying twice for the same sentence.
Audio you can inspect: format, sample rate and loudness fixed to a standard, listening passes before release, and generated files versioned so a regression can be traced.
One accountable vendor: one contract, one invoice and one entity for legal and finance to run diligence on, instead of a spread of contractors across four jurisdictions.
What To Ask A Text To Speech Software Development Company
- Ask to hear your own copy, not their sample script. Any voice sounds convincing on a sentence written to flatter it, and yours is where the seams appear.
- Ask how a mispronounced name gets fixed. If the answer is editing the input text, every new product name becomes a ticket rather than a lexicon entry made once.
- Ask whether audio streams or renders ahead. A user waiting on a full file feels every millisecond, and the answer changes the whole architecture.
- Ask what a thousand hours of audio costs. Synthesis is billed per character, so caching, reuse and a sensible re-render policy decide the bill more than the rate card does.
- Ask what happens if a voice is retired. Providers deprecate voices, and without a re-render plan your back catalogue quietly starts sounding like two different products.
- Ask who signed the consent for a cloned voice. A likeness is a person's, the paperwork sits with you, and nobody wants to find that out after launch.
How A Text To Speech Project Starts
Every project starts with a free 45-minute scoping session. No slide deck, no sales script. You bring the product, the script and the users who will hear it; you leave with a build plan and a timeline.
We are selective about new projects and cap how many we run at once, because the scoping is the product. If a recorded voice actor serves you better than synthesis, we will say so before you buy it.
Why Clients Choose Us
Full
Written IP Transfer
USA
Contract Entity
Yours
Audio & Voice Data
Named
Delivery Lead
Ready to give your product a voice that fits?
What We Build With TTS Audio
The Text to Speech Work We Deliver
Every product is different and the underlying jobs repeat: choose the voice, control how it reads, decide when the audio is made, and get it to the listener. These are the voice builds we deliver most often.
In-App Voice Playback
Streamed audio, cached, resumable
End-to-End
Long-Form Audio
Chapters, pacing, batch render
Batch Rendered
Voice Cloning
Consented likeness, model licensing
On File
IVR And Phone Systems
Telephony audio, barge-in ready
Live In Production
Offline TTS
On-device voices, no network
No Signal OK
Accessibility Audio
Read-aloud, WCAG, captions
Readable
TTS API Integration
Provider routing, quotas, fallback
Linked
Audio Quality Checks
Loudness, artefacts, listening tests
Sign-Off
Voice Migration Work
Provider swaps, re-renders, diffs
Future-Proof
Support & Re-Renders
Monitoring, new voices, updates
Kept Running
Not sure which voice surfaces you need? Let us map it.
Common Challenges
Why Do Text To Speech Builds Break?
Six patterns behind almost every voice feature that has to be rebuilt. All six start with a demo that sounded fine.
One Voice Tested
01
A voice is picked from three sentences on a vendor page. It then reads your actual catalogue, and the sibilance, the breath placement and the way it handles a long clause all become somebody's problem after launch.
Names Mispronounced
02
Your product name and your abbreviations come out wrong, and the workaround is to misspell the input text until it sounds right. That does not survive a copy change.
Latency On First Byte
03
The whole file is generated before anything plays. On a short prompt nobody notices. On a paragraph the user watches a spinner, and the feature feels broken.
No Voice Consent
04
A voice is cloned from a founder, a presenter or a customer recording, and nobody wrote down what they agreed to. The likeness belongs to a person, and permission is not implied.
Audio Cost Runs Away
05
Synthesis bills per character, and the same sentence is regenerated on every page load. Without caching or a reuse policy the invoice grows with traffic rather than with the product.
Voice Locked To Vendor
06
One provider is wired straight into the app with its own markup dialect. When the voice is retired or the price moves, switching supplier means a rewrite.
Recognise a few of these? Let us do it properly.
Our Voice Services
6 Text to Speech Services We Offer
Six ways to buy synthesised voice from one accountable vendor. Run one, or run several in parallel under a single contract.
Custom TTS Product Builds
01
End-to-end delivery of a defined voice feature: scope, voice selection, pipeline, caching and release, with a named lead who reports into you rather than into an account manager.
Voice & Audio Design
02
Shortlisting, blind listening tests against your own copy, and a written voice guide covering tone, pace and the sentences the voice must never be asked to read cold.
SSML & Prosody Tuning
03
Pauses, emphasis, rate and say-as rules built into the pipeline, so numbers, dates, currency and addresses are read the way a person would read them.
Pronunciation Lexicons
04
A maintained dictionary of your own names, terms and abbreviations, with a review route so a new product launch adds an entry rather than opening a defect.
TTS API & Backend Work
05
The services behind the audio, built by our own API development practice: synthesis endpoints, queueing, storage and delivery.
Voice Ops & Cost Control
06
Caching, reuse rules, provider fallback and a re-render plan for the day a voice is deprecated, so the audio bill tracks the product rather than the traffic.
Not sure which piece you need first? Let us scope it together.
Why Choose Us
What Makes Our Text to Speech Services Different
The details that decide whether synthesised audio still sounds right on the thousandth sentence.
A US Legal Entity
01
Stallyons is registered in Delaware. Your contract, your invoice and your legal recourse sit with a US company, not an unknown one.
Listening Tests First
02
Voices are shortlisted against your real script and judged blind by your own team, so the choice is recorded evidence rather than taste.
Overlap You Set
03
You choose the hours we share with your working day, and stand-ups, reviews and escalations all happen inside that window.
Consent On Record
04
No voice is cloned without written permission from the person it belongs to, and the paperwork is filed where your legal team can find it later.
Reviewed Code
05
Every merge is reviewed against an agreed definition of done, on your board, where you can read it yourself.
One Contract
06
One contract covers the engagement, so procurement, legal and finance each deal with a single named counterparty.
Ready to hear what a proper voice build sounds like?
Our Process
From First Call To Live Voice Audio In Six Steps
A build process that settles voice, pronunciation and latency before a line of playback code.
Discovery
Understand the listeners, script and product goals
Scoping
Agree voices, languages, scope and cost
Design
Voice guide, SSML rules and lexicon entries
Contracting
NDA, IP assignment, access and onboarding
Deliver
Built, cached, reviewed on merge
Tune & Monitor
Listen, fix pronunciation, watch the cost
Want to see how this maps to your roadmap?
Technology Stack
What Our Text to Speech Engineers Work With
The engines, markup and delivery tooling we build synthesised voice on, and what ships it to listeners.
Voice Engines
Neural TTS APIs
OpenAI Speech
Google Cloud TTS
Amazon Polly
Open Models
Audio & Speech Markup
SSML Markup
Prosody Controls
Lexicon Files
Phonemes
Timing Marks & Cues
Audio Pipeline
MP3, Opus, WAV
Sample Rates
Loudness Normalising
Audio Caching
CDN Audio Delivery
Product Surfaces
Web & App SDKs
IVR Systems
Audio Player
Accessibility Modes
Firebase Delivery
Build & Deliver
Python Services
Node Runtime
Docker Packaging
GitHub Actions / CD
Datadog Monitoring
Who We Build This For
Text to Speech Services For Every Kind Of Product
Eight kinds of product with different listeners and one shared need: audio that reads their content correctly.
EdTech & Learning
Lessons read aloud, set pacing
Accessibility Products
Screen reading, WCAG conformance
Media & Publishing
Article audio, long-form reads
Contact Centres
IVR prompts, queue announcements
Games & Interactive Media
Character lines, dynamic dialogue
Health & Patient Apps
Medication names said right
Transport & Transit
Stop announcements, alerts
Retail & Commerce Apps
Order updates, voice search
Working in another sector? See all industries we serve.
How We Compare
Your Text to Speech Build Options, Compared
An honest look at your four delivery options.
| Capability | Raw API Wiring | In-House Generalist | Freelance Audio Dev | Stallyons Technologies |
|---|---|---|---|---|
| Voice selection method | ✕ Whatever is default | Picked by taste | Sample reel only | Blind test on your script |
| Pronunciation of your names | ✕ Misspell the input | Fixed case by case | Ad hoc | Maintained lexicon |
| SSML and prosody control | Plain text only | Learned on the job | Basic tags | Rules built into the pipeline |
| Streaming versus batch audio | ✕ Full file every time | Decided late | ✕ No latency budget | Chosen against a budget |
| Cost per character and caching | ✕ Grows with traffic | Noticed on the invoice | Not in scope | Cache and reuse policy |
| Consent for a cloned voice | ✕ Nobody asks | Assumed | ✕ Undocumented | Written, filed with you |
| Provider fallback and portability | Single vendor | One integration | ✕ Hardwired | Routed, with a re-render plan |
See the difference for yourself
Complete Engagement
Everything Included In Your Text to Speech Build
From Scoping to Contracting to Delivery, One Vendor
Here is everything included when you build voice audio with us:
One Voice Build Price: No Hidden Fees And No Surprises.
Every voice engagement includes all eight components above. One contract, one senior team, one predictable cost, and no vendor sprawl.
🔒 No obligation. We'll deliver a detailed proposal within 48 hours.
Plus, Get These Free Bonuses
Free Voice Audio Review
A written read on your voice choice, pronunciation handling, latency and audio spend, with the fixes ordered by what a listener notices first.
Included Free
Build Plan And Estimate
A phased build plan with scope, milestones, the integrations it needs and a transparent, itemised estimate for the engagement.
Included Free
Free Vendor Checklist
The questions we would ask any text to speech vendor about voices, pronunciation, latency and cost, so you can put them to us too.
Included Free
Risk-Free Partnership
Our Text To Speech Promise
We stand behind every engagement with commitments that protect your investment.
01
Scope Agreed First
Scope, voices, working hours and cost structure are written down and agreed before contracting, so nothing is discovered later.
02
Built to Last
Senior developers, code review, automated tests, security and accessibility audits, and clean, documented code you fully own.
03
IP And Access Protected
NDA and IP assignment are signed before access, permissions are scoped per person, and your accounts stay under your control.
Start your voice build with confidence, backed by our Triple Protection Guarantee.
Track Record
Engagements That Ship, Scale, and Compound
500+
Projects Delivered
29+
Service Categories
81%
Repeat Client Rate
4.9 ★
Clutch Rating
"Stallyons took our Figma design and built it into a live web application, a cognitive game with level-based match play, messaging, a tutorial, and a directory that ranks users nationally. What impressed me most was their grasp of the code behind that logic, and the quality of the experience. Delivered on time with steady updates."
Jerry L.
Founder
PicCiti LLC
"We brought Stallyons in to absorb an overflow of work, and they delivered ten iOS and Android apps, from reporting to geo-location for logistics, plus several backend systems, owning design, development, and app-store submission. Everything stood out: code quality, speed, and reliability. Perfect code, on time, adopted company-wide."
William B.
Director
Amplo Solutions
FAQ
Frequently Asked Text To Speech Questions
Text to speech services turn your written content into spoken audio inside your own product. In practice that means selecting a voice against your real script rather than a sample reel, maintaining a pronunciation lexicon for your product names and jargon, controlling pauses and emphasis through SSML, deciding whether audio streams or renders ahead, and caching what you have already paid to generate.
Text to speech is one component: text goes in, audio comes out. A conversational voice agent is a whole system that also listens, works out what the caller wants, decides what to do and holds a turn-taking conversation, with synthesis as its final step. If what you need is a product that speaks its own content aloud, this page is the right one. If you need something that answers callers and completes tasks, see conversational voice systems.
Build cost follows the number of surfaces, how much SSML and lexicon work your content needs, and whether you want cloned voices or off-the-shelf ones. Running cost is separate and is billed by the provider per character, so caching and a reuse policy move it more than the rate does. We scope first, then price, and itemise each phase so you can cut before you commit.
With a lexicon rather than a workaround. Product names, place names, clinical terms, tickers and abbreviations get an explicit pronunciation entry, written in phonemes where spelling will not carry it, and applied everywhere the word appears. The alternative most teams fall into is misspelling the input text until it sounds right, which breaks the moment the copy changes.
You do, from the first day. The generated audio files, the lexicon, the pipeline and the repositories are yours, and provider accounts are registered in your name. NDA and IP assignment are signed before anyone gets access. Where a cloned voice is involved, the consent and the licence sit with you as well.
Only with that person’s written, informed permission, and with a licence that says where the voice may be used and for how long. We treat consent as a deliverable: it is collected before any model is trained, filed where your legal team can retrieve it, and reflected in how the voice is labelled to listeners. Without it, we will build you a licensed stock voice instead.
It depends on whether a person is waiting. Streaming starts playback while the rest is still being synthesised, which suits chat replies and anything interactive. Batch renders ahead and stores the file, which suits articles, lessons and announcements, costs less to serve and lets you check the audio before anyone hears it.
Often, and they are separate engineering problems rather than two halves of one job. Synthesis is about voice, pronunciation and prosody; recognition is about accents, noise, vocabulary and timestamps. We scope them together when a product needs both. The recognition side is covered on our speech to text page.
Still have questions? Let's talk.
Schedule an appointment with us today!
Ready To Build Text To Speech That Works?
Get a free consultation. We will listen to your content, name what will sound wrong, and send a written proposal.
