Most tape calculator apps bloat you with features you don't need — or get basic math wrong. ArithCalc does one thing well: fast, reliable running-total calculations on a clean tape you can review, edit, and reuse. Editable tape — fix any number, totals recalculate Labels per line ("Rent 650"), reads like notes Percentages: 650 + 10%, 500 - 30% Multiple documents, Undo/Redo, memory keys Fully offline — no account, no ads, no tracking Free on Google Play. Feedback welcome!