Issues

• NOT should accept arrays and ranges

  ironcalc/IronCalc#1528 · Filter by author dg-ac opened on Oct 13, 2026

• Browser app renders patternType="none" with color metadata as a black worksheet

  ironcalc/IronCalc#1500 · Filter by author spnvt63995 opened on Oct 8, 2026 · v0.9.0
  1

  

• Browser app retains a stale XLSX formula cache until formula reconfirmation

  ironcalc/IronCalc#1498 · Filter by author spnvt63995 opened on Oct 8, 2026
  1

• Data validation rules are dropped on load and save

  ironcalc/IronCalc#1490 · Filter by author philip-pentatonic opened on Oct 8, 2026

• Worksheet autoFilter is dropped on load and save

  ironcalc/IronCalc#1489 · Filter by author philip-pentatonic opened on Oct 8, 2026

• Loading an xlsx without xl/styles.xml fails

  ironcalc/IronCalc#1488 · Filter by author philip-pentatonic opened on Oct 8, 2026

• Support iterative calculation for circular references

  ironcalc/IronCalc#1465 · Filter by author SahilRajputdotexe opened on Oct 2, 2026

• Only SUMIF accepts array or range criteria; the rest of the IF/IFS family silently match nothing

  ironcalc/IronCalc#1454 · Filter by author perintyler opened on Sep 28, 2026 · v0.9.0
  1

  

• Add multiple values in one cell

  ironcalc/IronCalc#1450 · Filter by author nhatcher opened on Sep 24, 2026 · Version 2.0
  

• proposal: structured cell inspection api for ironcalc

  ironcalc/IronCalc#1429 · Filter by author Yudhyy opened on Sep 22, 2026

• UI: Linux/Windows vs Mac distintions in the interface

  ironcalc/IronCalc#1417 · Filter by author nhatcher opened on Sep 1, 2026 · Version 1.0
  

• Several full-column range walkers scan all 1,048,576 rows; approximate MATCH disagrees with Excel

  ironcalc/IronCalc#1414 · Filter by author NguyenNgoCongPhap opened on Aug 29, 2026

• EOMONTH errors when start date is 0

  ironcalc/IronCalc#1409 · Filter by author elsaminsut opened on Aug 27, 2026
  1

• EDATE returns #NUM! for blank start date instead of treating it as serial 0

  ironcalc/IronCalc#1400 · Filter by author elsaminsut opened on Aug 26, 2026
  

• Offer: ENCODEURL, HYPERLINK, and AGGREGATE implementations with tests

  ironcalc/IronCalc#1398 · Filter by author wms2537 opened on Aug 25, 2026
  2

  

• Coverage gaps — functions that error on valid input (checklist)

  ironcalc/IronCalc#1397 · Filter by author wms2537 opened on Aug 25, 2026
  

• XNPV rejects unordered date schedules accepted by Excel

  ironcalc/IronCalc#1396 · Filter by author wms2537 opened on Aug 25, 2026
  

• CHISQ.TEST and CHITEST underflow tiny p-values to exactly zero

  ironcalc/IronCalc#1395 · Filter by author wms2537 opened on Aug 25, 2026
  

• SUMPRODUCT multi-argument form silently returns 0 when a range contains text (Excel treats text as 0)

  ironcalc/IronCalc#1387 · Filter by author alejandroed opened on Aug 23, 2026
  

• COUNTIF/*IFS family returns #VALUE! for single-cell reference arguments

  ironcalc/IronCalc#1384 · Filter by author Axolotlsyzygy opened on Aug 22, 2026
  

• File > Delete Worksheet nonfunctional

  ironcalc/IronCalc#1383 · Filter by author thermburglar opened on Aug 20, 2026 · v0.9.0
  3

  

• Edge case failures in DATEVALUE

  ironcalc/IronCalc#1381 · Filter by author elsaminsut opened on Aug 20, 2026 · Version 1.0
  

• DATEVALUE doesn't accept dates with text month and whitespace separator

  ironcalc/IronCalc#1378 · Filter by author elsaminsut opened on Aug 20, 2026 · Version 1.0
  

• Edge case failures in HOUR, MINUTE, SECOND

  ironcalc/IronCalc#1374 · Filter by author elsaminsut opened on Aug 18, 2026 · Version 1.0
  

• Edge case failures in DATE function

  ironcalc/IronCalc#1373 · Filter by author elsaminsut opened on Aug 18, 2026 · Version 1.0