Introduction
I've spent the last six months benchmarking every major speech-to-text API for a client project. What surprised me wasn't that pricing varies wildly — it's that most "cheap" APIs aren't actually cheap once you factor in the hidden costs that pricing pages bury in fine print.
In this guide, I'll break down the cheapest speech-to-text APIs in 2026 for every budget level. I'll start with the genuinely free options, move through the sub-$20 tier, and then show you where the math breaks down at scale. For a deeper look at how fixed-rate vs per-minute billing actually changes your total cost, read our complete pricing guide.
Free Tier: What $0 Actually Gets You
Most free tiers are generous enough to get you started, but the limitations kick in fast.
| Provider | Free Tier | Key Limit |
|---|---|---|
| Privocio | 3 hours / 4 weeks | 400-word max per file |
| Deepgram | 12,000 minutes / year | Requires credit card |
| AssemblyAI | 50 hours / month | Standard model only |
| Google Cloud STT | 60 minutes / month | Strict rate limits |
| Azure Speech | 5 hours / month | 12-month trial |
I've used the Privocio free tier for quick prototyping — it's genuinely useful for testing integration before committing. The Deepgram free tier is the most generous in raw hours, but the credit card requirement kills it for hobbyists. AssemblyAI offers 50 hours monthly which sounds generous, but standard model accuracy drops noticeably on noisy audio.
Budget Tier ($0-$50/month): The Real Options
Once you outgrow the free tier, the budget tier is where most small teams live. Here's what I've found at real-world volumes:
| Provider | Entry Price | What You Get |
|---|---|---|
| Privocio | $19 / 4 weeks | 400 hours, all output modes |
| Deepgram | ~$0.0043/min | Pay-as-you-go, no minimum |
| AssemblyAI | ~$0.0067/min | Core model, no add-ons |
| Google Cloud | ~$0.006/min | Standard model only |
| AWS Transcribe | ~$0.004/min | Batch processing, no streaming |
At 50 hours per month, Privocio's Go plan at $19/4 weeks is roughly $0.05/hour. Compare that to Deepgram's $0.0043/minute which works out to about $0.26/hour. At this volume, the fixed-rate option saves about 80%.
But here's the catch: if you're only transcribing 10 hours per month, per-minute APIs are cheaper. The breakeven point for most fixed-rate plans sits around 50 hours monthly.
Scale Tier ($50-$500/month): Where Per-Minute Pricing Hurts
This is where I see the most bill shock. Teams at 200-400 hours per month get absolutely destroyed by per-minute pricing.
| Provider | 200 hrs/month | 400 hrs/month |
|---|---|---|
| Privocio | $19 | $19 |
| Deepgram | ~$52 | ~$103 |
| AssemblyAI | ~$80 | ~$160 |
| Google Cloud | ~$72 | ~$144 |
| AWS Transcribe | ~$48 | ~$96 |
Bottom line: At 400 hours per month, Privocio's $19 plan costs roughly 95% less than the cheapest per-minute option. I've watched teams get $400+ monthly bills for what should be a fixed $19 line item.
How to Choose the Right API for Your Budget
I've developed a simple framework for matching budget to provider:
- Under 20 hours/month: Use any free tier or per-minute API. Fixed pricing doesn't make sense yet.
- 20-50 hours/month: This is the gray zone. Do the math for your specific volume. If you're trending upward, lock in fixed pricing early.
- 50+ hours/month: Fixed pricing almost always wins. Per-minute APIs start compounding fast.
- Variable volume: If your usage swings wildly month-to-month, per-minute is safer. Fixed pricing penalizes low-usage months.
Also factor in the hidden costs I covered in our hidden costs guide: per-minute rounding, concurrency limits, diarization add-ons, and streaming premiums. These can add 20-40% to your per-minute bill.
Frequently Asked Questions
Is Privocio really cheaper than the big providers?
Yes — at 50+ hours per month. Below that, per-minute APIs are more cost-effective. Our pricing page has a calculator that lets you plug in your exact volume.
What's the cheapest option for real-time streaming?
For real-time, Deepgram offers the best per-minute rate. But streaming carries a 2x premium over batch on most platforms. If you can batch process, fixed-rate plans win by an even wider margin.
Can I start free and switch later?
Absolutely. Most teams start with a free tier to validate accuracy, then migrate once volume justifies a paid plan. Just watch your volume — per-minute pricing gets expensive faster than you'd expect.
What about open-source alternatives?
Self-hosted Whisper is free in terms of API fees, but you'll pay for GPU time, maintenance, and engineering hours. For our full breakdown of self-hosted costs, see our self-hosted guide.
Conclusion: The Cheapest Option Depends on Your Volume
After running the numbers on six different APIs, I can tell you this: there is no single "cheapest" speech-to-text API. Under 50 hours per month, per-minute providers win. Above 50 hours, fixed pricing is almost always cheaper — and far more predictable.
If you're evaluating options, start with our free tier to test accuracy on your actual audio. Then do the math. At your volume, what's the real cost per hour?
Related: For the full pricing comparison across all providers, read our Speech-to-Text API Pricing 2026 guide.