The top easy-access accounts are the Coventry BS Online Saver 5, and BM Savings, part of Halifax, Online Reward 3.
Both pay 1.6% before tax (1.28% after tax), but limit savers to four free withdrawals a year. The BM Savings rate includes a 1.1 (0.88) percentage point bonus for the first 12 months.
The best deal with no restrictions comes from Sainsbury's Bank: its eSaver Special at 1.55% (1.25%).
On fixed-rate deals you can earn 2.03% (1.62%) for one year or 2.21% (1.77%) for two years from Britannia, part of Co-op Bank. For three years the top rate comes from ICICI Bank at 2.55% (2.04%).
On tax-free cash Isas the best easy-access deal comes from Tesco at 2%, but you can't transfer existing cash Isas into this account. The best deals for transfers are 1.75% from Virgin Money on £1, or 2% with BM Savings as long as you have a minimum £15,000.
Looking at fixed-rate cash Isas, Britannia pays 2% for a year or 2.25% for two years. The top three-year deal comes from Coventry Building Society at 2.35%.
This article was written for our sister website Money Observer