Should I Buy It?

Enter what you want to buy, its price against your income, how often you would use it, what you already have and how long you have wanted it, and Jev judges whether buying is wise, how impulsive the wish is and whether you would regret it. Free.

Judged by Jev
Currency
How often you would use it
Do you already have something that would do?
How long you have wanted it
This month’s budget
Can it be returned?

What you enter is sent through our server to TypeSafe’s Jev model to be judged, and is not stored. Jev knows no outside facts: it judges only from what you write.

Example: what you will see

A made-up case as judged on 2026-09-22.

Buy or notWait and see
  • Buying is wise41%

A few judgments

  • You would regret it within a month44%
  • Better to decide in 30 days53%
  • A need, not a want44%
  • What you have is good enough28%

How impulsive

  1. Well considered
  2. A little impulsive
  3. Clearly impulsive
  4. Pure impulse

Your numbers

Share of a month’s income
12.2%

How to use Should I Buy It?

Enter what you want to buy, its price against your income, how often you would use it, what you already have and how long you have wanted it, and Jev judges whether buying is wise, how impulsive the wish is and whether you would regret it. Free.

Input
The thing, its price and currency, your monthly income, how often you would use it, what you already have, how long you have wanted it, this month’s budget, whether it can be returned, and a line on why (optional)
Output
Buy / wait and see / don’t, with the probability; how impulsive, in four levels; whether you would regret it, whether waiting 30 days would be better, whether it is a need or a want, whether what you have is enough; the price as a share of a month’s income; a summary to copy
Processing
What you enter is sent through our server to TypeSafe’s Jev model and not stored; prices are calculated in your browser
  1. Say what you want to buy and enter the price and your monthly income (used only for the ratio; never sent).
  2. Choose how often you would use it, what you already have, how long you have wanted it, the budget and whether it can be returned; complete the human check.
  3. Read the verdict, how impulsive it is and the judgments.

FAQ

How does it judge?

The page first works out the price as a share of a month’s income and hands it with your choices to Jev (jev-1.13.0) as one description: is buying wise now, would you regret it within a month, would waiting 30 days be better, is it a need or a want, is what you have enough, and how impulsive is the wish, in four levels. Three rounds, averaged. A 60% or higher chance that buying is wise reads “buy”, under 40% “don’t”.

Does Jev know whether it is worth the price?

No. It knows no products or prices; it judges only from the price, income and use you entered. To compare prices, look elsewhere.

Is my income sent anywhere?

No. Price and income are turned into “share of a month’s income” in your browser; that ratio and your choices are what Jev sees.

Is what I enter stored?

No. What you enter is sent through the ToolMelo server to TypeSafe’s Jev API to be judged and is not written to a database or a log afterwards. Every judgment needs a Cloudflare Turnstile human check, and one IP address can run 3 a minute.

Why wait 30 days?

Putting an impulse aside for a while is the oldest cure for it. Jev is asked separately whether deciding in 30 days would be better; when that chance is high, the wishlist is the place for it.

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