Redeeming a Gumroad license or invite code

If you have a Gumroad license key or an invite code, redeeming it takes a moment — here's where to enter it.

5 min readUpdated 2026-11-11

Two kinds of code unlock RoomSketch3D without a card payment: a Gumroad licence key from a purchase made through Gumroad, and a gift code sent to you directly (an invite, a prize, a replacement). Both are redeemed from the web unlock screen and both unlock lifetime access on the account you're signed in to.

Codes are redeemed on the web only, at app.roomsketch3d.com in a browser (a computer, or your phone's browser). The iPhone, iPad and Android apps can't take a code: their unlock screen doesn't show either option. Redeem in the browser first, then sign in to the app with the same account and it's unlocked.

Here's where each code comes from, where to enter it, and what to do if it's refused.

Step by step

1
Find your code
Gumroad licence: in the receipt email Gumroad sent after purchase — a key in four groups, `XXXXXXXX-XXXXXXXX-XXXXXXXX-XXXXXXXX`. Gift code: in the message we sent you; it looks like `GIFT-XXXXXXXX`. Copy it exactly; spaces at either end are fine, but every character in between matters. Capital or small letters don't matter: the box turns what you type into capitals.
2
Sign in to the account you want unlocked — in a browser
Open app.roomsketch3d.com in a browser (not the iPhone or Android app) and sign in with Google, Apple or your email. The code binds to this account, so use the sign-in you'll keep using on every device. If you use the app with Continue with Apple or Continue with Google, pick the same button on the web. If you're already unlocked you'll go straight to the editor and won't see the unlock screen at all. An account is one email address: Google, Apple or an emailed code with the same address all reach it. The exception is Apple's Hide My Email, whose relay address is an account of its own, so if that's how you use the app, choose Apple on the web too. Why a browser: the iPhone, iPad and Android apps' unlock screen only offers the store purchase and Restore purchase; it has no gift-code or Gumroad option (shown here). Your phone's browser works fine.
In the apps the unlock screen has no code option, so redeem in a browser.
3
Gumroad: the Gumroad license link
On the web unlock screen, tap Account at the end of the small line at the bottom (after Terms and Privacy), then Gumroad license in the sheet that opens. The Activate Gumroad License dialog (subtitled Already purchased on Gumroad?) says Enter the license key from your Gumroad purchase receipt email to activate your access. Paste the key and press Activate. The editor opens as soon as the key is verified. Under the box, Can't find your key? Check your Gumroad library opens your purchases on Gumroad (app.gumroad.com/library), where the key is listed with the product. If you arrived from a Gumroad link that already carries your key, it's checked automatically once you sign in.
Account at the bottom of the web unlock screen opens this sheet: Gumroad license is the middle button.
4
Gift code: Have a gift code?
On the web unlock screen press Have a gift code?, the first link in the small line at the bottom. The Redeem Gift Code dialog reads Enter your gift code to unlock full lifetime access — no payment needed. Paste the code and press Redeem. If you opened an invite link in a browser, the code is applied automatically the moment you sign in there — you'll see Activating your gift access... (Invite links don't apply a code inside the iPhone or Android app.)
Paste the gift code and press Redeem.

If a code is refused: what the message means

The reason appears in red in the dialog, under the box.

Message	What it means	What to do
This license key is already in use by another account	The Gumroad key was activated on a different RoomSketch3D account.	Sign in to that account, or email support with both addresses.
This license has been refunded	The Gumroad purchase was refunded.	Email support if you think that's a mistake.
This license is no longer valid	The Gumroad payment was charged back or is under dispute.	Email support with the Gumroad receipt.
This license has exceeded the maximum number of activations…	The key has been checked more times than allowed.	Email support with the Gumroad receipt.
Invalid license key format / Invalid license key	A character is missing or wrong.	Copy and paste the whole key, dashes included.
Invalid invite code	No gift code with those characters exists.	Check it letter by letter; paste rather than type.
This invite code is no longer active	The code was switched off.	Ask whoever sent it for a new one.
This invite code has reached its usage limit	A shared code (a giveaway, say) has been used as many times as it allows.	Ask whoever sent it for a new one.
You have already redeemed this invite code.	This account used it before.	Check Settings: the account may already be Premium.

Activate Gumroad License dialog in RoomSketch3D with the four-group license key box, Activate button and Check your Gumroad library link — The Gumroad dialog: paste the key, press Activate; any problem shows in red under the box.

6
Check it worked
Open the avatar menu → Settings. A Premium badge beside your name means the code is on this account. Now open the iPhone, iPad or Android app and sign in the same way (same button, same email): it opens unlocked.
Premium on the account card: the code is on this account.

Tips

Can't find the Gumroad email?

Search your mail for 'Gumroad' and 'RoomSketch3D'. Gumroad can also resend receipts from the link on their site, and the dialog's Check your Gumroad library link opens app.gumroad.com/library, which lists what you've bought with that email.

Redeem on the web, then use any device

Codes can only be entered at app.roomsketch3d.com in a browser. Once the account is Premium, the iPhone, iPad and Android apps unlock as soon as you sign in with that account.

Common mistakes

Redeeming on the wrong account

A Gumroad key unlocks one account, and a gift code can be redeemed once per account. If you signed in with your Gmail today and with Apple's Hide My Email tomorrow, those are two accounts and only one of them is unlocked. Use the same email address everywhere.

Redeeming in the app

The iPhone, iPad and Android apps have no code box, and an invite link opened inside the app doesn't apply the code. Open app.roomsketch3d.com in a browser, redeem there, then sign in to the app.

Typing the key by hand

One wrong character and it's refused. Copy and paste it from the email.

Frequently asked questions

Can I use the same code on multiple accounts?

A Gumroad key: no, it unlocks one account (a second account gets This license key is already in use by another account). A gift code: each account can redeem it once, and a code made for a group (a giveaway, say) works for a set number of people before it reports reached its usage limit. Either way, the unlocked account then works on every device. If you need to move a purchase to another account, email support with both addresses.

My Gumroad key says invalid — what now?

Check you pasted the whole key including the dashes, and that it's the RoomSketch3D product key. If it still fails, email support with the Gumroad receipt and the email you're signed in with.

I redeemed a code but the app still shows the unlock screen

You're signed in to a different account on that device. Sign out and sign in with the account you redeemed on (same button, same email). Restore purchase in the app won't help here: it only re-checks an Apple or Google purchase, not a code.

Can I enter my code in the iPhone or Android app?

No. The app's unlock screen has no code or Gumroad option. Open app.roomsketch3d.com in a browser (your phone's browser works too), sign in, redeem the code there, then sign in to the app with the same account.

Do codes expire?

Gumroad licence keys don't. Gift codes don't carry an expiry date either, but a shared code can run out of uses (This invite code has reached its usage limit) or be switched off (This invite code is no longer active), so redeem it when you get it.

Can I use a Gumroad key and still buy in the app later?

There's no need: once the key is on your account, the account is Premium on every device. Sign in to the app with the same account instead of buying again.

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