Small tools. Big hours back.
Thirty focused add-ins that fix the chores Office makes you do by hand — cleaning data, comparing sheets, checking emails, filling documents. Free to start, one-time payment for Pro, and nothing you open ever leaves your device.
- Runs 100% on your device
- No data sent to any server
- No AI · no cloud · no tracking
Your work never leaves your device
The real reason to trust a tool with your spreadsheets, contracts and inbox: it has nothing to send.
AI assistants like Copilot do their work by sending the text of your documents, spreadsheets and emails to a server. Genuinely useful — but you can't see what's transmitted, how long it's kept, or whether it's used to train a model. For confidential work, that uncertainty is reason enough to leave the add-in closed.
Brightpane is the opposite. Every add-in runs entirely inside Office, on your own machine. Your content is read and edited locally — it's never uploaded, logged, or shared. The only moment an add-in touches the internet is a one-off check of your Pro license key, which sends the key and nothing else.
A typical cloud AI tool
- Sends your document text to a server to work
- You can't see what's stored, or for how long
- Your content may help train a model
- Needs an account and a live connection
A Brightpane add-in
- Reads and edits your content locally, inside Office
- Nothing is uploaded, logged, or shared
- No AI, no cloud processing, no tracking
- Works offline — only the license check goes online
Read the full privacy policy — it's short, because there isn't much to say.
One job each. Done well.
Every Brightpane add-in does one thing you actually do every week — and does it in one click instead of twenty. Thirty tools, grouped by the app they live in.
Excel 6 add-ins
TidySheet
One-click cleanup of messy spreadsheet data — trim, dedupe, split, extract.
SheetDiff
Compare two sheets and see exactly what changed, highlighted in place.
SheetMerge
Combine sheets and CSV files into one master sheet — one header, all the rows.
FormulaMap
Audit your formulas: hardcoded numbers, volatile functions, errors and risky links.
MockData
Generate realistic fake data for testing and demos — seeded, local, nobody's data.
SheetIndex
A clickable table-of-contents sheet for big workbooks — rebuilt in one click.
Word 5 add-ins
DocFill
Fill Word templates with {placeholders} from a form — or a whole table of data.
DocDoctor
Repair broken numbering and rogue styles in one pass — diagnose first, then fix.
SafeToSend
Pre-flight check for documents: tracked changes, comments and metadata.
WordStats
Readability, reading time and sentence-level stats — find what drags your text down.
AcroFind
Find every acronym in the document and build the definitions table.
Outlook 16 add-ins
SendCheck
Pre-send safety checks: missing attachments, external recipients, your own checklist.
SnipMail
Email snippets and templates with fill-in variables, stored privately in your mailbox.
AutoBCC
Auto-add Bcc or Cc to every email you compose, with rules you control.
SignSwitch
Multiple signatures, auto-picked by recipient or context.
PhishLens
A one-glance phishing inspector for any message — local heuristics, no cloud.
HeaderHawk
Readable email headers: SPF/DKIM/DMARC verdicts and the delivery path.
AttachDrop
Save all attachments at once, with rename patterns like {date}_{sender}_{name}.
SenderNotes
Private notes per sender, shown the moment they email you.
MailTask
Turn emails into a follow-up list with due dates — no email forgotten.
CleanQuote
Tidy ugly quoted reply chains before you send — preview first, then apply.
SubjectTag
One-click subject prefixes and naming conventions — never doubled up.
MeetAgenda
Agenda and action-item templates for meeting invites, timeboxed automatically.
UnsubScout
Find the real unsubscribe link in any newsletter — and see where it goes first.
ContactGrab
Extract contact details from email signatures — straight to a vCard.
DateDrop
Insert dates, deadlines and timezone-safe meeting times at the cursor.
PrintMail
A clean, printable view of any email — the print tool new Outlook forgot.
Why Brightpane
The boring promises that actually matter.
Your data never leaves the document
Everything runs locally inside Office. No uploads, no cloud, no AI, no analytics, no tracking. The only network call is checking your license key. More on privacy →
Works everywhere Office does
One add-in, three platforms: Windows, Mac, and Office on the web. Same buttons, same results.
Pay once, use forever
No subscription, no account, no seat licenses. Buy a Pro key once, keep it for good — free updates included. The free tier is free forever.
Built by an indie developer
One person builds and supports these tools. Emails get answered by the developer, not a ticket queue. Honest about what each tool can and can't do.
Frequently asked questions
Do these add-ins send my data anywhere?
No. Your spreadsheets, documents and emails are read and changed locally inside Office and never leave your device — no uploads, no cloud processing, no AI, no tracking. Unlike Copilot-style assistants, there's no server doing the work, so there's nothing to send. The only network call an add-in ever makes is verifying your Pro license key, which transmits the key and nothing else. See the privacy policy.
How do I install an add-in?
Each tool is a standard Office add-in. Download its manifest file and upload it through Office's own add-in dialog — about two minutes, no admin rights needed in most setups. Step-by-step instructions are on the install page. AppSource listings are on the way, which will make it a one-click install from inside Office.
How do license keys work?
When you buy a Pro upgrade on Gumroad, you get a license key instantly with your receipt. Paste it into the add-in's pane and the Pro tools unlock right away. Your key works on all the devices you personally use — switching computers just means pasting it again.
What if it doesn't work for me?
30-day money-back guarantee on every product, no questions asked. Reply to your Gumroad receipt or email [email protected] and you'll get a refund.
Do the free tiers expire?
No. The free tools are free forever — they're not a trial. Pro unlocks the heavier features on top.
Where do I get support?
Email [email protected]. You'll hear back from the person who wrote the code.