Friends with Habits
Money & Savings
90-Day No-Spend Challenge with a Friend
Buy nothing beyond the essentials, and have someone to confess the takeout to.
Android today, iPhone next. Free to download and use.
What it is
A no-spend challenge means buying nothing beyond the essentials for a set number of days. Rent, bills, groceries, medicine and getting to work are allowed. Takeout, clothes, apps, impulse buys and “it was on sale” are not. You decide the exact list before day one, and you write it down.
It works better with a friend because most no-spend challenges fail in one unplanned moment: a checkout page at 11pm, a group dinner, a bad day. Knowing you'll report back to someone tonight is often enough to close the tab.
Ninety days turns a challenge into a new default. Expect the second month to be harder than the first: the novelty is gone and the exceptions get more persuasive. People who go the distance often relax one rule at day 30 on purpose, rather than by accident.
How to do it
- Write your essentials list before you start: what you'll still pay for, and a weekly grocery budget.
- Delete saved cards from the shops you buy from most, and unsubscribe from their emails.
- Check in once a day: yes if you bought nothing outside the list, no if you did. No partial credit.
- Keep a running note of what you wanted to buy and didn't. It's the most useful thing you'll have at the end.
Day by day
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Days 1–3
Set it up
Agree on the essentials list with your partner, pause anything you'd be tempted to renew, and plan the first weekend: it's where most people break.
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Days 4–30
The novelty wears off
The first urges show up as “small exceptions”. Text your partner before you buy, not after. If it can wait 48 hours, it isn't essential.
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Days 31–72
The long middle
The savings stop feeling new and the friction starts to feel personal. Swap one thing you'd normally buy for something free each week, and compare notes with your partner on what you've stopped missing.
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Days 73–90
The finish line
Add up what you didn't spend, together. Decide which rules you'll keep before the challenge ends, or the first day after becomes a spending spree.
Milestones over 90 days
Days 30 and 60: re-commit
Re-commit at day 30 and again at day 60. Each time, talk with your partner about what's working and change one thing. A 90-day challenge is three 30-day ones in a row, not one long slog.
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Day 30: the first audit
Add up what you didn't spend in month one, and read back your list of things you wanted. Most people find it's shorter than they expected. Decide with your partner whether any rule needs to change, then re-commit.
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Day 45: the boredom wall
Halfway is where a long no-spend challenge feels least rewarding: the savings are routine and the restrictions aren't. Plan one free thing with your partner that week, and give the money you're keeping a job, like a debt payment or a trip.
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Day 90: decide the new normal
By now some of your rules are habits. Pick the two or three you'll keep for good, write them down and tell your partner. A planned exit beats a spending spree.
Where people quit, and how a partner helps
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The social invite
Dinner or drinks with people who aren't doing the challenge. Decide your answer before it happens: suggest a cheaper plan, or set a cap in advance. A partner who's doing it too makes “I'm on a no-spend month” an easy sentence to say.
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The late-night checkout
Most impulse buys happen tired, alone, with a phone. A rule that works: anything you want, send it to your partner first and wait until tomorrow. Most of it you'll never mention again.
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The one slip that ends it
Buying one thing turns into “I've already failed, so why not”. You haven't failed. Check in honestly, tell your partner and carry on tomorrow. A streak that restarts is worth more than a challenge you quietly abandon.
Your 90-day tracker
Print this page, or tick the boxes here. Ticks are saved in this browser only. In the app, you and your partner see each other's check-ins as they happen. One tick a day.
You
Your partner
How to start it in the app
- Create your free account, then install Friends with Habits from Google Play and sign in.
- Tap New Pact and pick “No-spend day” under Money & Savings.
- The template suggests 3 days a week. For this challenge, change it to every day.
- Invite your friend by link, text or email. Once they accept, you both check in each day and see each other's progress.
- A pact in the app runs 30 days. Re-commit when it ends, and again at day 60, and your shared streak carries across all 90 days.
Questions
What counts as an essential on a no-spend challenge?
Whatever you agree before you start, written down. The usual list is housing, utilities, groceries up to a set budget, transport to work, medicine and debt payments. Anything not on the list waits until the challenge ends.
Can I still buy groceries?
Yes. Set a weekly grocery budget and stick to it, and leave snacks, alcohol and takeout off the list unless you've agreed otherwise. The point is to stop unplanned spending, not to stop eating.
Do my partner and I need the same rules?
No. Your essentials can differ: one of you may have kids, a commute or a car. What matters is that each of you writes your list down and the other one knows what it says.
How do I handle birthdays and holidays in a 90-day no-spend challenge?
Plan them in. Before you start, list the gifts and events that fall inside the 90 days and set a budget for each one. Planned spending you both agreed to doesn't break the challenge; unplanned spending does.
Is 90 days too long?
It's a real commitment, which is why it's done as three 30-day pacts. Each re-commit is a natural point to check in with your partner. If you're unsure, start with 30 and re-commit if it's going well.
What happens if one of us misses a day?
Your partner sees it, and the app nudges you both. Check in honestly and pick it back up the next day. People who finish a challenge are rarely the ones who never missed; they're the ones who came back the day after.
What if I don't have a friend doing this challenge?
An accountability partner doesn't need to be a close friend or an expert, only someone who'll notice. A coworker, a sibling or someone from a group chat works. Invite one person; most people say yes to a challenge with an end date.
Do we both need the app?
Yes. Each of you checks in from your own phone, which is the point: you see when your partner has done it today, and they see you. Friends with Habits is on Android via Google Play today, and an iPhone version is next.
Is it free?
Yes. Friends with Habits is free to download and free to use, with no card. A free account tracks a limited number of active habits at a time, which leaves plenty of room for one challenge.
Other lengths
Do it together
Start this challenge with a friend
Free to start. Create your account, pick “No-spend day” in the app and invite the friend who's doing it with you.
Android today, iPhone next. Free to download and use.