AI companions and characters
Pi: review, pricing, data and alternatives
Pi helps people hold written or spoken conversations with an assistant. Users can explore ideas and topics, prepare for a difficult conversation, and build a personal action plan. A free tier exists. Access and transparency score: 48/100, #4 of 5 in its category.
What is Pi?
Pi helps people hold written or spoken conversations with an assistant. Users can explore ideas and topics, prepare for a difficult conversation, and build a personal action plan.
According to its documentation, Pi lets you:
- chat in writing
- talk with an assistant by voice
- explore ideas and topics
- prepare for a difficult conversation
- build a personal action plan
We file it under AI companions and characters, the category of tools to chat with virtual characters, and it also overlaps with general AI chatbots. The category lists 5 verified tools on this site.
The publisher is Inflection AI, Inc., based in United States. The service launched in 2023, which gives it some track record.
Who is it for?
It is for anyone who wants to chat with virtual characters.
Pi is a good candidate if:
- you want to try before paying
- you also work from your phone
Before deciding, run a trial on a real task and measure the time saved: it is the only criterion that really counts.
How much does Pi cost?
Pricing model: free. Basic use costs nothing.
To estimate what the same work would cost done directly with an AI model, use our API price calculator. Prices change often: always check the official site before subscribing.
Data and privacy
According to its privacy policy, data is processed in several regions depending on the plan.
No export feature is documented: keep a copy of your content elsewhere.
Three habits apply to every AI tool:
- turn off the use of your content for training if the option exists
- use a work account separate from your personal account
- review everything the tool produces before publishing or sending it
Platforms, languages and API
Pi runs on: web browser, iPhone and iPad, and Android.
Interface languages: English.
API availability is not documented.
How we scored it
Our 48/100 score does not judge output quality: it measures what can be publicly verified about access to the tool, its openness and how far the publisher can be trusted.
| Criterion | Points | What counts |
|---|---|---|
| Access | 15/30 | free tier, published price, French interface |
| Openness | 0/30 | API, data export, open code |
| Trust | 33/40 | identified publisher, declared hosting, age, presence in reference lists |
The full calculation is explained on our method page.
Comparison with alternatives
Pi against other tools in the aI companions and characters category:
| Tool | Free | Entry price | API | Score |
|---|---|---|---|---|
| Pi | Yes | not published | – | 48 |
| HammerAI | Yes | $1.99 pay as you go | – | 58 |
| Character.AI | Yes | $4.99 per month | – | 56 |
| Replika | Yes | not published | – | 50 |
| DoaCam | Yes | not published | – | 28 |
Verdict
Pi publishes little verifiable information: look at the better-scored alternatives first.
Strengths
- Free tier to try it
- Established since 2023
Limitations
- Data export not documented
Avoid if…
- You need to easily retrieve your full history
Alternatives
- HammerAIfree tier
- Character.AIfree tier
- Replikafree tier
- DoaCamfree tier
Categories and jobs
Learn more
Frequently asked questions
Is Pi free?
Yes, a free plan exists, with usage limits.
Where is Pi data stored?
According to the publisher, in several regions depending on the plan.
Does Pi have an API?
It is not documented.
What are the alternatives to Pi?
In the same category: HammerAI, Character.AI, Replika, and DoaCam.
Pi or HammerAI: which one to choose?
Our score is 48/100 for Pi and 58/100 for HammerAI. Try both on the same task before paying.
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Neutrality. No affiliate links. No vendor pays to be reviewed, rated or ranked. Reviews are directed by François Chollet, neutral and factual, and every data point is dated and sourced. How we score