ParseRail
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PromptUnit
FreemiumAPI
PromptUnit is a proxy that sits in front of existing AI SDK calls and reroutes traffic to cheaper models.
20% of verified savings · Free tier: Unlimited API calls proxied. Free observation mode indefinitely. No card needed. Cancel anytime. · Checked Jun 11, 2026
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Summary
It observes live traffic for fourteen days, builds a quality model, then begins swapping requests to lower-cost equivalents while keeping output fidelity within defined bounds. The service charges only a share of the savings it produces rather than a fixed subscription. Because it works through standard SDK endpoints, teams avoid any application changes yet still receive per-model cost breakdowns in real time. The unavoidable cost is a measured median latency increase of 41 ms plus the initial two-week wait before any routing activates.
Bottom line: _Choose it when monthly AI spend exceeds a few thousand dollars and 50 ms extra latency is acceptable; avoid it when response time is the binding constraint._
Pricing Plans
Usage-BasedLast verified 5 months ago- Price
- 20% of verified savings
- Free Tier
- Unlimited API calls proxied. Free observation mode indefinitely. No card needed. Cancel anytime.
Free Observation Mode
Free
Monitor traffic and show exact savings before any charge. No automatic billing. Only charge after verified savings.
- Unlimited API calls proxied
- All 5 providers (OpenAI, Anthropic, Google, Groq, DeepSeek)
- Smart model routing (Inferiou2122 engine)
- Real-time cost analytics dashboard
- Cross-provider routing
- Full request/response logging
- Quality guardrails
- Email spend alerts
- Spending caps (hourly and daily limits)
- 14-day observation period
Pay-as-you-save
Custom
20% of verified savings. Calculated as 20% of the difference between baseline spend (without PromptUnit) and actual spend through PromptUnit. If difference is zero, bill is zero.
- 20% of verified savings charged monthly
- Only charge after delivering measurable value
- No subscription
- No flat fee
- No contracts
View full pricing on promptunit.ai →
Pricing may have changed since last verified. Check the official site for current plans.
Find your fit
Before you choose PromptUnit
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Pros
- No code changes required; works with existing SDKs
- Performance-based pricing means savings are shared with vendor
- 14-day free observation period before routing goes live
- Real-time cost breakdown by model, feature, and user
- Explains routing decisions for transparency
Cons
- Adds median 41ms latency to API calls
- Requires observation period before realizing savings
About
- Platforms
- Cloud-based
- API Available
- Yes
- Self-Hosted
- No
- Last Updated
- May 16, 2026
Best For
Who it's for
- Engineering teams with high AI API spend
- Organizations using multiple AI providers
- Teams wanting cost optimization without code changes
- Companies needing detailed AI spending analytics
What it does well
- Reducing AI API costs for engineering teams
- Gaining visibility into AI spending by feature and user
- Testing cost optimization before committing to routing changes
- Automatic failover if primary AI provider is unreachable
Integrations
Compare PromptUnit
Frequently Asked Questions
- Is PromptUnit free?
- PromptUnit offers a free option alongside paid upgrades. Pricing: 20% of verified savings. Check the current allowances and terms before choosing a plan.
- Does PromptUnit have an API?
- Yes. PromptUnit exposes a developer API. See the official documentation at https://promptunit.ai for details.
- What platforms does PromptUnit support?
- PromptUnit is available on: Cloud-based.
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PromptUnit is a proxy that sits in front of existing AI SDK calls and reroutes traffic to cheaper models.
It observes live traffic for fourteen days, builds a quality model, then begins swapping requests to lower-cost equivalents while keeping output fidelity within defined bounds. The service charges only a share of the savings it produces rather than a fixed subscription. Because it works through standard SDK endpoints, teams avoid any application changes yet still receive per-model cost breakdowns in real time. The unavoidable cost is a measured median latency increase of 41 ms plus the initial two-week wait before any routing activates.
_Choose it when monthly AI spend exceeds a few thousand dollars and 50 ms extra latency is acceptable; avoid it when response time is the binding constraint._
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