Image API Checklist: How to Choose a Provider

Choosing an image generation API is a decision you'll live with for months or years. Switching providers means rebuilding templates and updating integrations. So it's worth evaluating properly before committing.

I've tested most of the major providers over the past year. This is the checklist I use when evaluating a new one, organized from most important to least important as of March 2026.

The 20 point checklistThe 20-Point Checklist

Pricing points 1 5Pricing (Points 1-5)

1. What's the per-image cost at your expected volume?

Don't just look at the monthly price. Calculate the per-image cost at your actual volume. A $30/month plan with 3,000 credits ($0.01/image) is cheaper per image than a $15/month plan with 500 credits ($0.03/image).

2. Is there a permanent free tier?

A free tier isn't just for saving money. It's for testing indefinitely, running small projects, and building proofs of concept. "50 one-time trial credits" isn't a free tier. It's a demo.

3. Are there per-seat charges?

Most providers charge by API usage. Abyssale charges per seat ($12-60/seat/month). That means a team of 5 pays 5x. Make sure you understand the billing model.

4. Do unused credits roll over?

Only Placid and RenderForm carry unused credits to the next month. Everyone else: use them or lose them. If your usage varies, rollover saves real money.

5. What happens when you hit your limit?

Some providers cut you off (Bannerbear, Placid). Others offer overage pricing (Orshot at $18/1K). And some let you upgrade mid-cycle (Imejis.io). Know which model you're signing up for.

---

Api design points 6 10API Design (Points 6-10)

6. Is the API response synchronous or asynchronous?

This is a bigger deal than it sounds. Synchronous APIs return the image directly in the response. Async APIs return a job ID and you poll for the result or wait for a webhook.

For simple integrations, synchronous is easier. One request, one image. No webhook infrastructure needed.

7. How many endpoints do you need to learn?

Imejis.io has one endpoint. Bannerbear has multiple for templates, images, videos, collections, and rendering. Simpler APIs mean faster integration and fewer things to break.

8. Are there SDKs for your language?

Check if the provider has official SDKs for your tech stack. Most offer Node.js and Python. Fewer support Go, Ruby, PHP, or .NET. No SDK means you're writing raw HTTP calls.

9. Is the documentation clear?

This is subjective but important. Open the docs before you sign up. Can you understand the authentication flow, request format, and response structure in 10 minutes? If not, that's a red flag for integration speed.

10. Can you generate images via URL (GET request)?

Some providers let you generate images by constructing a URL with query parameters. This is useful for embedding dynamic images in emails, Notion pages, or anywhere you can place an image tag but can't make API calls.

---

Template editor points 11 14Template Editor (Points 11-14)

11. Is the editor drag-and-drop or code-based?

Drag-and-drop editors (Imejis.io, Bannerbear, Placid) let designers work without code. Code-based editors (Creatomate's JSON, APITemplate's HTML) give developers more control but exclude non-technical team members.

12. Can non-technical people use it?

If your marketing team or clients need to create templates, the editor must be accessible. Public links (Imejis.io) and Studio features (Placid) let non-developers generate images without touching the API.

13. Are there template limits?

Some providers cap the number of templates per plan:

If you run an agency with 20+ clients, each needing their own branded templates, limits matter.

14. Is there a template library?

Starting from scratch is slower than starting from a pre-built template. Check the library size and quality. Some providers have hundreds of templates. Others have a handful.

---

Output and reliability points 15 18Output and Reliability (Points 15-18)

15. How long are generated images retained?

This is the sleeper issue. Some providers delete your images after days or weeks.

If you store image URLs in a database and expect them to work months later, check this first.

16. What output formats are supported?

Most providers support PNG and JPEG. Check for WebP (smaller files), PDF (documents), and video formats if you need them.

17. Is there an uptime SLA?

For production workloads, an SLA matters. Imejis.io offers 99.9% uptime. Some newer providers (Orshot) only offer SLAs on Enterprise plans. No SLA means no guaranteed reliability.

18. What's the typical render speed?

Template APIs range from 200ms to 10 seconds per image. Faster rendering matters for real-time use cases like dynamic OG images. Ask for actual numbers, not marketing claims.

---

Integrations and support points 19 20Integrations and Support (Points 19-20)

19. Does it integrate with your existing tools?

Check for the specific platforms you use:

20. What support channels exist?

Email-only support with 24-hour response times is fine for development. For production issues at 2am, you want faster options. Check if the provider offers chat, priority support, or dedicated account managers on your plan.

---

How providers stack upHow Providers Stack Up

Here's a summary of how the major providers score across the checklist as of March 2026:

No single provider wins every category. But for most image-focused use cases, Imejis.io hits the sweet spot of price, simplicity, and reliability. If you need video, look at Bannerbear or Placid. If you need the cheapest per-image cost at high volume, Orshot is worth evaluating.

For detailed pricing across all providers, see our Image Generation API Pricing Comparison. And if you're comparing specific tools, we have head-to-head posts for Orshot vs Imejis, Canva API vs Template APIs, and Best Bannerbear Alternatives.

FaqFAQ

What should i look for in an image generation apiWhat should I look for in an image generation API?

Focus on five things: per-image cost at your expected volume, free tier for testing, API response type (instant vs async), image retention policy, and template editor quality. Everything else is secondary.

Which api is best for beginnersWhich API is best for beginners?

Imejis.io has the lowest learning curve. One API endpoint, instant image response, a Canva-like visual editor, and a permanent free tier of 100 calls/month.

How important is image retentionHow important is image retention?

Very. Some providers delete generated images after 14-30 days. If you store image URLs in a database, those links break. Check the retention policy before committing.

Should i choose an api with video supportShould I choose an API with video support?

Only if you need video. Video-capable APIs cost more. If you only generate images, a focused image API like Imejis.io is cheaper and simpler.

How do i test before payingHow do I test before paying?

Use the free tier. Imejis.io gives 100 calls/month permanently. APITemplate.io gives 50/month. Build a real template and test with actual data before committing.

Start evaluatingStart Evaluating

The best way to test is to actually test. Sign up for Imejis.io with 100 free API calls per month, create a template, and generate your first image. Most developers are done in under 30 minutes. No credit card, no sales call, no commitment.