The best AI under
Several AI tools offer plans under

At this price point, most single-model tools offer basic access with usage caps. You might get a limited number of messages per day or reduced access to premium models. Multi-model platforms at this price can offer surprisingly broad access because they use credit-based systems that let you choose how to spend your allocation.
| Platform | Price | Models | Features |
|---|---|---|---|
| Krater Plus | $9/mo | 350+ | Chat, images, audio, AI detection |
| ChatGPT (no paid plan under | $20/mo | GPT only | Chat, DALL-E |
| Claude (no paid plan under | $20/mo | Claude only | Chat only |
| Perplexity | $8/mo (yearly) | Multiple | Search-focused chat |
At under
Watch out for plans that advertise low prices but limit you in ways that matter:
Krater's Plus plan at $9/month includes 500 credits that work across all 350+ models with no artificial feature gates. See also best AI under $20 for more options.
Krater Plus at $9/month ($7.50/month on yearly billing) is one of the most affordable options that includes access to 350+ AI models plus image and audio tools.
Free AI access is heavily limited — usually a few messages per day with older models. For consistent, reliable access, even the cheapest paid plan is a significant upgrade.
For moderate use (writing, research, occasional image generation), 500 credits per month covers most needs. Heavier users should consider the Pro plan at $20/month with 1,500 credits.