Stridefly vs spreadsheets and Tiller

What Spreadsheets and Tiller is built for

A spreadsheet is the most flexible tool in this comparison. You decide every column, formula and chart, nothing is hidden, and the file is yours. Tiller adds bank and card feeds to Google Sheets or Excel templates, with automatic categorization, and says your transactions, balances and categories live in a spreadsheet you own, not on Tiller's servers.

In September 2026 Tiller added an Investments beta with Holdings and Holdings History sheets, currently for Google Sheets. Allocation and any other analysis come from formulas you write. For people who enjoy that work, it means complete control and a portable file, and for asset-location rules or custom logic a spreadsheet can do things no app screen does.

Where investors run into limits

Allocation, drift and rebalance logic is yours to build and maintain. Tiller's own comparison says investments run through custom sheets, and its beta announcement pairs the new sheets with a contest inviting users to build their own investment tools.
Tiller's Investments beta works with Google Sheets only for now. Excel is described as coming soon.
Tiller has no dedicated app. On a phone you work through the Google Sheets or Excel mobile apps, where a sheet laid out for a laptop screen isn't a finished allocation view.

What Stridefly adds

Finished screens instead of formulas: allocation by asset class and sub-class, targets you set, drift, and a rebalance plan listing buy and sell amounts. It is arithmetic against your numbers, not advice.
Positions viewed by account owner and by taxable versus retirement, with portfolio value over time, the day compared with the S&P 500 and a dividend and income calendar.
CSV import for positions, transactions and net worth history, with skipped rows listed, so an export of your current sheet can come with you.
Your data on your phone and in your own iCloud account. Connections pass through a service we operate that does not keep copies of your balances, positions or transactions.

Side by side

Feature	Stridefly	Spreadsheets and Tiller
Platforms	iPhone (iOS 18 or later)	Any device with Google Sheets or Excel; Tiller's Investments beta is Google Sheets only
Budgeting	Monthly and annual budgets by category, with optional rollover of unused money	Whatever you build; Tiller provides templates and automatic categorization
Investment positions	Yes, across brokerage and retirement accounts	Holdings sheets in Tiller's beta; otherwise entered by hand
Allocation targets and rebalance plan	Yes. You set the targets; Stridefly shows drift and a plan listing buy and sell amounts	You build it with your own formulas
Imports	CSV files for transactions, net worth history and positions; skipped rows are listed	Your own spreadsheet data; bank feeds through Tiller
Where your data is stored	Your phone and your iCloud account. Connections pass through a service we operate that does not keep copies of your balances, positions or transactions	A file you own at Google or Microsoft

Sources

Details checked October 2026. Products change; see each company's site for the latest.

Questions about this comparison

Can I import my spreadsheet into Stridefly?

Export the sheet as a CSV file. Stridefly imports positions, transactions and net worth history from CSV files and lists any rows it skips.

Is Stridefly more flexible than a spreadsheet?

No. A spreadsheet can hold any rule you can write, and Stridefly's screens work the way they work. Stridefly trades that flexibility for finished allocation, drift and rebalance views you don't have to maintain.

Does Tiller keep my data on its servers?

Tiller says your transactions, balances and categories live in a spreadsheet you own, not on Tiller's servers. Stridefly saves your data on your phone and in your own iCloud account.