Spread WinRT provides these built-in functions, listed alphabetically.

ABS	ACCRINT	ACCRINTM
ACOS	ACOSH	ADDRESS
AMORDEGRC	AMORLINC	AND
ASIN	ASINH	ATAN
ATAN2	ATANH	AVEDEV
AVERAGE	AVERAGEA	AVERAGEIF
AVERAGEIFS	BESSELI	BESSELJ
BESSELK	BESSELY	BETADIST
BETAINV	BIN2DEC	BIN2HEX
BIN2OCT	BINOMDIST	CEILING
CHAR	CHIDIST	CHIINV
CHITEST	CHOOSE	CLEAN
CODE	COLUMN	COLUMNS
COMBIN	COMPLEX	CONCATENATE
CONFIDENCE	CONVERT	CORREL
COS	COSH	COUNT
COUNTA	COUNTBLANK	COUNTIF
COUNTIFS	COUPDAYBS	COUPDAYS
COUPDAYSNC	COUPNCD	COUPNUM
COUPPCD	COVAR	CRITBINOM
CUMIPMT	CUMPRINC

DATE	DATEDIF	DATEVALUE
DAVERAGE	DAY	DAYS360
DB	DCOUNT	DCOUNTA
DDB	DEC2BIN	DEC2HEX
DEC2OCT	DEGREES	DELTA
DEVSQ	DGET	DISC
DMAX	DMIN	DOLLAR
DOLLARDE	DOLLARFR	DPRODUCT
DSTDEV	DSTDEVP	DSUM
DURATION	DVAR	DVARP
EDATE	EFFECT	EOMONTH
ERF	ERFC	ERROR.TYPE
EURO	EUROCONVERT	EVEN
EXACT	EXP	EXPONDIST

FACT	FACTDOUBLE	FALSE
FDIST	FIND	FINV
FISHER	FISHERINV	FIXED
FLOOR	FORECAST	FREQUENCY
FTEST	FV	FVSCHEDULE
GAMMADIST	GAMMAINV	GAMMALN
GCD	GEOMEAN	GESTEP
GROWTH	HARMEAN	HEX2BIN
HEX2DEC	HEX2OCT	HLOOKUP
HOUR	HYPGEOMDIST

IF	IFERROR	IMABS
IMAGINARY	IMARGUMENT	IMCONJUGATE
IMCOS	IMDIV	IMEXP
IMLN	IMLOG2	IMLOG10
IMPOWER	IMPRODUCT	IMREAL
IMSIN	IMSQRT	IMSUB
IMSUM	INDEX	INT
INTERCEPT	INTRATE	IPMT
IRR	ISBLANK	ISERR
ISERROR	ISEVEN	ISLOGICAL
ISNA	ISNONTEXT	ISNUMBER
ISODD	ISPMT	ISREF
ISTEXT	KURT	LARGE
LCM	LEFT	LEN
LINEST	LN	LOG
LOG10	LOGEST	LOGINV
LOGNORMDIST	LOOKUP	LOWER

MATCH	MAX	MAXA
MDETERM	MDURATION	MEDIAN
MID	MIN	MINA
MINUTE	MINVERSE	MIRR
MMULT	MOD	MODE
MONTH	MROUND	MULTINOMIAL
N	NA	NEGBINOMDIST
NETWORKDAYS	NOMINAL	NORMDIST
NORMINV	NORMSDIST	NORMSINV
NOT	NOW	NPER
NPV	OCT2BIN	OCT2DEC
OCT2HEX	ODD	ODDFPRICE
ODDFYIELD	ODDLPRICE	ODDLYIELD
OFFSET	OR	OFFSET

PEARSON	PERCENTILE	PERCENTRANK
PERMUT	PI	PMT
POISSON	POWER	PPMT
PRICE	PRICEDISC	PRICEMAT
PROB	PRODUCT	PROPER
PV	QUARTILE	QUOTIENT
RADIANS	RAND	RANDBETWEEN
RANK	RATE	RECEIVED
REPLACE	REPT	RIGHT
ROMAN	ROUND	ROUNDDOWN
ROUNDUP	ROW	ROWS
RSQ

SEARCH	SECOND	SERIESSUM
SIGN	SIN	SINH
SKEW	SLN	SLOPE
SMALL	SQRT	SQRTPI
STANDARDIZE	STDEV	STDEVA
STDEVP	STDEVPA	STEYX
SUBSTITUTE	SUBTOTAL	SUM
SUMIF	SUMIFS	SUMPRODUCT
SUMSQ	SUMX2MY2	SUMX2PY2
SUMXMY2	SYD	T
TAN	TANH	TBILLEQ
TBILLPRICE	TBILLYIELD	TDIST
TEXT	TIME	TIMEVALUE
TINV	TODAY	TRANSPOSE
TREND	TRIM	TRIMMEAN
TRUE	TRUNC	TTEST
TYPE	TTEST	TYPE

UPPER	VALUE	VAR
VAR.P	VAR.S	VARA
VARP	VARPA	VDB
VLOOKUP	WEEKDAY	WEEKNUM
WEIBULL	WORKDAY	XIRR
XNPV	YEAR	YEARFRAC
YIELD	YIELDDISC	YIELDMAT
ZTEST