Shortlist by what you need
Start here if you know why you are leaving Respan.
Want the closest match?
RequestyMost similar to Respan in what it does, its category and its price.
Visit (opens Requesty in a new tab)Need a free plan?
BraintrustHas a free plan, rated 4.2 out of 5.
Visit (opens Braintrust in a new tab)Want the lowest price?
AI/ML APIFrom $20/mo, the lowest starting price here.
Visit (opens AI/ML API in a new tab)Want the best rated?
QualifireRated 4.0 out of 5 in our review, against 4.1 for Respan.
Visit (opens Qualifire in a new tab)
At a glance
Green means better than Respan, red means worse. Prices are starting prices per month.
| Tool | Our rating | Starts at | Free plan | Best for | Compare |
|---|---|---|---|---|---|
 RespanBaseline | 4.1 | Free | Yes | One endpoint to 1,000 models, with tracing, evaluation and alerting behind it. | |
| Requesty | 3.9−0.2 | Free | Yes | One API for 600-plus models, marked up 5%, with the markup stated on the page. | vs Respan |
 Vynaris | 3.5−0.6 | $45/mo | No | An OpenAI- and Anthropic-compatible gateway that sends each call to the cheapest model that meets your quality bar | vs Respan |
| Braintrust | 4.2+0.1 | $249/mo | Yes | Raised an ICONIQ-led $80M Series B building the evaluation layer teams use to ship AI products with confidence | vs Respan |
| Qualifire | 4.0−0.1 | Not listed | No | Guardrails, evaluation and red-teaming for LLM apps, with judge models fast enough for runtime. | vs Respan |
 Eden AI | 3.7−0.4 | Not listed | No | One API routes to 500+ AI models across 50+ providers - OpenAI, Anthropic, Google, AWS, Cohere and more - with automatic fallback if a provider goes down, no markup on the underlying cost. | vs Respan |
| AI/ML API | 4.1Same | $20/mo | No | Single OpenAI-compatible endpoint for calling GPT, Claude, Gemini, and 400-plus other AI models. | vs Respan |
 Langtail | 3.9−0.2 | $99/mo | Yes | Prompt management platform where teams test, compare, and monitor LLM prompts before shipping them. | vs Respan |
 CometAPI | 3.8−0.3 | Not listed | No | CometAPI routes requests to 500+ AI models from OpenAI, Anthropic, Google, and other providers through a single API key priced below list rate. | vs Respan |
The alternatives in detail
In order of how closely each one matches Respan.
Requesty
3.9Free
vs Respan−0.2
One API for 600-plus models, marked up 5%, with the markup stated on the page.
- Routes across 30+ providers and 600+ models
- Automatic failover, load balancing and cost/latency-based routing
- Prompt caching claimed to cut token costs up to 90%
States its 5% markup plainly rather than burying it in a rate card
A single routing layer between your app and every model is a new dependency
Vynaris
3.5$45/mo
vs Respan−0.6
An OpenAI- and Anthropic-compatible gateway that sends each call to the cheapest model that meets your quality bar.
- Drop-in gateway compatible with the OpenAI and Anthropic APIs
- Routes each request to the cheapest model that passes current evaluations
- A routing receipt per call showing the model used, latency and cost
Switching needs one base_url change
Still in early beta
Braintrust
4.2$249/mo
vs Respan+0.1
Raised an ICONIQ-led $80M Series B building the evaluation layer teams use to ship AI products with confidence.
- Evaluation-first platform, not just logging and tracing after the fact
- Lets teams test and score AI product behavior before shipping
- Tracing priced per GB for production observability
Evaluation-first approach catches failures a pure logging tool would only surface after the fact
Jump from free straight to $249/month with no mid-tier option limits gradual scaling
Qualifire
4.0Not listed
vs Respan−0.1
Guardrails, evaluation and red-teaming for LLM apps, with judge models fast enough for runtime.
- Contextual guardrails enforced in real time
- Continuous evaluation and observability
- Rogue agent evaluator and red-team platform
Small judge models make runtime checking affordable
No pricing published anywhere
Eden AI
3.7Not listed
vs Respan−0.4
One API routes to 500+ AI models across 50+ providers - OpenAI, Anthropic, Google, AWS, Cohere and more - with automatic fallback if a provider goes down, no markup on the underlying cost.
- 500+ AI models across 50+ providers through one unified API
- Automatic fallback routing when a provider fails
- No markup on underlying provider pricing (flat 5.5% platform fee)
Automatic provider fallback prevents a single vendor's outage from becoming your outage
5.5% platform fee still adds to costs at high volume
AI/ML API
4.1$20/mo
vs RespanSame
Single OpenAI-compatible endpoint for calling GPT, Claude, Gemini, and 400-plus other AI models.
- Single endpoint for 400-plus AI models
- OpenAI SDK-compatible, no code rewrite needed to switch models
- Unified credit-based billing across all providers
One integration covers hundreds of models instead of numerous separate SDKs
No permanent free tier once starter tokens are used
Langtail
3.9$99/mo
vs Respan−0.2
Prompt management platform where teams test, compare, and monitor LLM prompts before shipping them.
- Side-by-side prompt and model version comparison
- Automated evaluations via natural language rules, pattern matching, or custom code
- Production logging and debugging traces
Free tier is functional enough for solo developers to evaluate the product
Free plan's 1,000 monthly logs will not cover production traffic for most real apps
CometAPI
3.8Not listed
vs Respan−0.3
CometAPI routes requests to 500+ AI models from OpenAI, Anthropic, Google, and other providers through a single API key priced below list rate.
- Single API key for 500+ models across major AI providers
- Pay-as-you-go pricing around 20% below providers' list rates
- One-line model switching without re-authentication
Cuts the integration work of managing multiple provider SDKs and keys
Founded in January 2025, with a limited track record so far
FAQ
Questions people ask
Is Respan free?
Respan has a free plan.
What is the best free alternative to Respan?
Braintrust is the highest-rated alternative here with a free plan (4.2 out of 5). Other free options: Requesty, Langtail.
What is the cheapest alternative to Respan?
Among paid plans, AI/ML API has the lowest starting price (from $20/mo). If you need it free, start with Braintrust.
How did you pick these alternatives?
We match tools on what they do, their category and their price, using the details in our directory. Ratings come from our reviews and reader reviews.